5i'
MONTAGE: REC. M.130 EN T | TE DE CETTE PAGE
Recommandation M.140
DESIGNATIONS OF INTERNATIONAL CIRCUITS, GROUPS, GROUP AND
LINE LINKS, DIGITAL BLOCKS, DIGITAL PATHS, DATA
TRANSMISSION SYSTEMS AND RELATED INFORMATION
CONTENTS
0 General
1 Designations of international public switched circuits
2 Related information for international public switched
circuits
3 Designations of international fixed (non switched) cir-
cuits
4 Related information for international fixed circuits
5 Designations of international groups, supergroups, etc.
(bidirectional and unidirectional)
6 Designations of international group links, supergroup
links and line links
7 Related information for international groups, group links
and line links
8 Designations of international digital blocks
(bidirectional and unidirectional)
9 Designations of international digital paths
10 Designations of routes in the mixed analogue/digital
transmission network
11 Designation of data transmission systems
12 Related information for international digital blocks,
digital paths and data transmission systems
Annex A - Full examples for designation information
Annex B - Reference section numbers for the various
types of routes
Note - For the definition of the terms unidirectional,
bidirectional, one way and two way (both way), refer to
Recommendation E.600 [1] (definitions 3.3 and 3.4).
0 General
Designation of international routes are of great importance
for identification and information.
Technical developments, especially those due to digital tech-
nology have brought a much greater variety of techniques and allow
for a more efficient use of equipment.
Information on the equipment and techniques used is of great
interest to staff working in the field of maintenance and opera-
tion. Present operational conditions can be more complicated than
those previously, e.g. as a consequence of greater competition in
the field of telecommunication. Another consideration is automated
file handling which is often a necessity for Administrations and
the standardization of designation is an important factor to
_________________________
The term " routes " is used in this text to cover all
types of telecommunication connections: circuits,
groups, blocks. etc.
facilitate this.
To cover the need for standardized designations which are easy
to handle but which give precise information, the designation
information is built up from two layers:
- layer 1 provides the unique identification: the
designation ;
- layer 2 provides the necessary additional infor-
mation which must be known at both terminations of the routes: the
related information .
If Administrations need more route data to be stored, they are
free to create independently or bilaterally a third layer for which
no standardization is intended for the time being.
0.1 Layer 1
The general format of layer 1 for the designation of all types
of international routes is shown in Table 1/M.140.
H.T. [T1.140]
TABLE 1/M.140
__________________________________________________________________________________________________________________________________________________________
Format of designation Town A / Suffix - Town B / Suffix Function code Serial number
__________________________________________________________________________________________________________________________________________________________
Signs Characters Slash Letters/ digits Hyphen Characters Slash Letters/ digits Space Letters/ digits Digits
__________________________________________________________________________________________________________________________________________________________
Number of characters 12 1 3 1 12 1 3 1 6 4
__________________________________________________________________________________________________________________________________________________________
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Table 1/M.140 [T1.140], p.
The use of suffixes applies particularly to international pub-
lic switched circuits. Their use is optional for international
non-switched circuits, groups, group links, digital blocks and
paths and data transmission systems. It provides more detailed
information on the termination of the routes.
The first part of the designation, the traffic relation,
presents the origin and destination of a route. The function code
shows the type of route whilst the serial number counts the routes
(i.e. circuits, groups, digital blocks, etc.) within the same
traffic relation and same function code.
If a town name exceeds 12 characters, Administrations should
apply a suitable abbreviation which should be unique.
If identical place names occur in different countries, and if
confusion is likely to arise, the Administrations concerned should
agree to identify the country in the designation by adding after
the place name a three letter country code as defined in
ISO 3166 [2]. This country code must be included within the 12
characters of the town name, if necessary by providing an abbrevia-
tion of the town name.
The serial number should be written without leading zeros.
0.2 Layer 2
The general format for layer 2 (related information) is as
follows:
1 . | | | . | | |
2 . | | | . | | |
3 . | | | . | | | etc.
The numbers identifying the fields in layer 2 indicate the
various items. Each item provides information on the route,
e.g. operational | operating companies and control station,
etc. or technical | analogue/digital, use of special
equipment etc. The items provide flexibility in designation infor-
mation because they can be extended in the future if there is a
need.
0.3 Layer 3
Not subject to standardization at the present time.
0.4 Implementation
It is recommended that the new designation types be applied to
newly installed routes starting on 1 January 1990 (or earlier with
the agreement of the Administrations involved).
Existing route designations (circuits, groups, digital blocks,
etc.) should be converted gradually. The conversion to the new type
designation should be completed by 1 January 1994.
To facilitate the change, Administrations with control station
responsibility should prepare proposals containing designations
conforming to layer 1 and propose the items of related information
to be included in layer 2.
Agreement should then follow on the designation as well as an
exchange of the agreed layer 2 information.
Administrations will need to ensure that the layer 2 related
information is kept up to date and that other concerned Administra-
tions are informed of any changes.
1 Designations of international public switched circuits
1.1 General
The format of the designation of public switched circuits is
shown in Table 2/M.140.
The elements of the format are as follows:
a) Traffic relation
Towns A and B (maximum 12 characters or space, see
Note 1): refers to the names of the two towns in which the interna-
tional exchanges of the circuit are located. The place names in all
types of designations should always be written in Roman characters
taking the official name of a town as used in the country to which
it belongs (see S 0.1).
International exchange suffix (maximum 3 alpha-numeric
characters): the international exchange is indicated by letters,
digits or a combination. The suffix will refer to the whole
exchange (to the building or to a part of it, see Note 2). It will
be chosen by the Administration, see Note 3 and 4.
H.T. [T2.140]
TABLE 2/M.140
_____________________________________________________________________________________________________________________________________________________
Format of designation Town A / {
Inter
national exchange suffix
} - Town B / {
Inter
national exchange suffix
} Function code Serial number
_____________________________________________________________________________________________________________________________________________________
Signs Characters Slash Letters/ digits Hyphen Characters Slash Letters/ digits Space Letters Digits
_____________________________________________________________________________________________________________________________________________________
Number of characters 12 1 3 1 12 1 3 1 1 or 2 4
_____________________________________________________________________________________________________________________________________________________
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Table 2/M.140 [T2.140], p.
b) Function code | (1 or 2 alphabetical charac-
ters)
The function code indicates the type of circuit.
c) Serial number | (maximum 4 numeric characters)
The serial numbering starts anew if there is a difference
in:
- town A or town B;
- international exchange suffix;
- function code.
Note 1 - If the name of the town exceeds 12 characters the
responsible Administration will supply an appropriate abbreviation,
which should be unique.
Note 2 - In the example given in Figure 1/M.140 there may
be only one suffix or three to be decided by the Administration.
Note 3 - The 3 alphanumeric characters make it possible to
include carrier's name information in the suffix, e.g. Tokyo/SJK:
the international exchange in Tokyo-Shinjuku where the K in the
suffix reflects the responsible carrier KDD.
Note 4 - The different companies operating in the same
town have to agree on the suffixes used, in order that they be dif-
ferent.
Figure 1/M.140, p.
1.2 Telephone-type circuits
1.2.1 General
Possible function codes are:
M manual telephone circuits
Z automatic and semi-automatic telephone circuits
in one-way operation
B both-way telephone circuits
The serial number has a maximum of 4 numeric characters.
Serial numbering starts anew if there is a difference in:
- town A or town B
- international exchange suffix
_________________________
By bilateral agreement Administrations may wish to ap-
ply a serial number to telephone-type circuits on a
town-to-town basis rather than on an
exchange-to-exchange basis.
- function code.
1.2.2 Telephone circuits used in manual operation
The terminal points of the circuit are arranged in alphabeti-
cal order.
The function code is: M.
Example:
The first telephone circuit for manual operation between
London Keybridge and Paris Bagnolet is designated:
London/KB-Paris/BAG M1.
1.2.3 One-way telephone circuits used for semi-automatic or
automatic operation
The terminal points of the circuits are arranged in the order
according to the direction of operation of the circuit.
The function code is: Z.
Serial numbering: Circuits operated in the direction
corresponding to the alphabetical order of the terminations should
have odd numbers. Circuits operated in the direction corresponding
to an inverse alphabetical order of the terminations should have
even numbers.
Examples:
The 11th circuit operated in the London Mollison to
Montreal 1TE direction (alphabetical order of towns) is designated:
London/SM-Montreal/1TE Z21.
The 9th circuit operated in the Montreal 1TE to London
Mollison direction (inverse alphabetical order of towns) is desig-
nated:
Montreal/1TE-London/SM Z18.
1.2.4 Both-way telephone circuits used for semi-automatic
or automatic operation
The terminal points of the circuit are arranged in
_________________________
By bilateral agreement, Administrations may wish to ap-
ply continuous serial numbering on Z + B circuits.
alphabetical order.
The function code is: B.
Example:
The first both-way circuit between London Kelvin and New
York 24 is designated:
London/J-New York/24 B1.
1.3 Circuit used for switched telex and telegraph services
See CCITT Recommendation R.70 [3].
1.4 Circuits in the international public switched data net-
work
The terminations of the circuit are arranged in alphabetical
order.
The function code is: XD.
Example:
The first international public switched data circuit
between Oslo A and Stockolm H is designated:
Oslo/A-Stockholm/HYX XD1.
1.5 Related information
The additional information on public switched circuits is
covered by the following items:
1. urgency for restoration;
2. terminal countries;
3. administrations' or carriers' names;
4. control and subcontrol station(s);
5. fault report points;
6. routing;
7. association;
8. equipment information;
9. use;
10. transmission medium information;
11. composition of transmission;
12. bandwith or bit rate;
13. signalling type.
The various items will be dealt with in S 2.
2 Related information for international public switched cir-
cuit
The following sections explain the items of related informa-
tion concerned with international public switched circuits. A full
example for the designation information of an international public
switched telephone circuit is given in Annex A, S A.1.
2.1 Urgency for restoration (item 1)
This item supplies information on the urgency of restoration
of the circuit based upon bilateral agreement between the terminal
Administrations.
Format:
1. xxx . | | | xx; (maximum 10 characters)
Illustration :
a) if the priority is top: 1;
if the priority is second: 2;
if the priority is third: 3; or
b) if repair is required within e.g. 24 hours:
24 h; or
c) if no urgency has to be indicated: -;
2.2 Terminal countries (item 2)
This item presents the countries in which the circuit is ter-
minating.
Format:
2. XXX, YYY; (3 characters for each)
Specification:
XXX: code for country of town A
YYY: code for country of town B
Note - The codes are according to ISO Standard 3166 [2].
Example:
For the circuit London/KB-Tokyo/SJK Z101:
2. GBR, JNP:
2.3 Names of Administrations or carriers (item 3)
This item records the names of the Administrations or carriers
which operate the circuit.
Format:
3. YYYYYY, ZZZZZZ; (maximum 6 characters for each)
Specification:
YYYYYY code for company operating in town A
ZZZZZZ code for company operating in town B
Example:
For the circuit London/KB-Tokyo/SJK Z101 operated by BTI
and KDD:
3. BTI, KDD;
2.4 Control station [sub-control station(s)] (item 4)
This item lists the appointed control station and sub-control
stations (according to Recommendations M.80 and M.90). Further
details about the stations can be found in the list of contact
points (Recommendation M.93).
Format:
4. CS: designation of control station,
SCS1: designation of sub-control station,
SCS2: designation of sub-control station,
. . . .
. . . .
. . . .
SCSn: designation of sub-control station.
Specification:
CS: designation of the control station,
SCS1: designation of the terminal sub-control sta-
tion,
SCS2 to SCSn: if applicable, other sub-control sta-
tions; have to be placed in the geographical order according to the
traffic relation.
Example:
For the circuit New York/10-Stockholm/1 B1 where New York
is the control station and sub-control stations are in London and
Stockholm:
4. CS: New York,
SCS1: Stockholm,
SCS2: London;
2.5 Fault report points (item 5)
This item presents the names of both fault report points on
the circuit. Further information about the fault report points can
be found in the list of contact points (Recommendation M.93).
Format:
5. Designation of fault report point, designation
of fault report point;
Specification:
The first report point is that of the country of town A.
The second fault report point is that of the country of
town B.
Example:
For the circuit London/M-Reims/IP1 Z999 with fault report
points in London M and Reims XRE:
5. London/M, Reims/XRE;
2.6 Routing (item 6)
This item shows the international primary group(s) or primary
block(s) and channel number(s) which carry the circuit. If there
are more than one, the groups or blocks appear in the geographical
order from town A to town B.
Format:
6. Designation of an international primary group
or primary block/channel number, designation of a primary
group/channel number, . | | , designation of a primary
group/channel number;
Note - Primary groups or blocks can be unidirectional as
well. Two consecutive unidirectional groups or blocks are
separated by a + sign instead of a comma.
Example:
For a circuit London/KB-Santiago/1 Z27:
6. London-Paris 1204/4, Paris-(MU)
1202/2+Santiago-(MU) 1203/3;
2.7 Association (item 7)
This item informs whether there are associated circuits and if
so, of which nature.
Format:
7. Association code: designation of associated
circuit;
Specification:
If the circuit has a reserve circuit the association code
is: S followed by the function code and the serial number of the
principal circuit.
If the circuit is a reserve circuit the association code
is: Function code followed by S and the serial number of the
reserve circuit.
Example:
7. ZS13: Roma/AS1-Zuerich/SEL T1;
Which indicates that the actual circuit Z13 is a reserve
circuit for the circuit Roma/AS1-Zuerich/SEL T1.
2.8 Equipement information (item 8)
This item records any equipment in the circuit which requires
special maintenance attention.
Format:
8. XX, XX, XX, XX, XX;
Specification:
If the circuit has been routed via analogue circuit multi-
plication equipment: AM
If the circuit has been routed via digital circuit multi-
plication equipment:
- using reduced bit rate encoding: RB
- using speech interpolation: SI
If the circuit has a compandor: CO
If the circuit has an echo suppressor: ES
If the circuit has an echo cancellor: EC
If the circuit has an echo suppressor in terminal country
of town A and an echo cancellor in terminal country of town B: ES,
EC (any combination of EC and ES is possible).
If the circuit is a bearer circuit: BC
If the circuit is a derived circuit: DC
Note 1 - If there is a need to record an additional spe-
cial equipment, the places free for a code are available for this
purpose. They can be used after bilateral agreement between the
Administrations. The codes must be unique and shall have two char-
acters.
Note 2 - A bearer circuit refers to the circuit type that
continues to be provided in the case of a breakdown of the circuit
multiplication equipment. For a derived circuit this is not the
case.
2.9 Use (item 9)
This item supplies information on the usage of the circuit. It
concerns the role of the circuit in the traffic (e.g. belonging to
a final route) and the usage of the circuit made by the user.
Format:
9. XX, YYYY; (maximum 7 characters)
Specification:
XX refers to the type of traffic carried by the
circuit:
- if it belongs to a final group of circuits: FN
- if it belongs to an overflow group of circuits: OF
- if it belongs to a transit group of circuits: TR
- if the information is not known: -
YYYY refers to the use of the circuit:
in the case where a public telephone circuit is used for
phototelegraphy or facsimile: F
2.10 Transmission medium information (item 10)
This item identifies whether a satellite is involved in the
routing of the circuit.
Format:
10. ST; or -;
Specification:
If the circuit has been routed via satellite: ST
If the circuit is not being routed via satellite: -
Example:
For the circuit Amsterdam/2H-New York/24 Z33 routed partly
via satellite:
10. ST;
2.11 Composition of the transmission (item 11)
This item shows the type of transmission on the circuit.
Format:
11. A; or N; or C;
Specification:
If the transmission is analogue: A
If the transmission is digital: N
If the transmission is mixed analogue/digital: C
2.12 Bandwidth or bit rate (item 12)
This item shows the bandwidth (in the case of an analogue or
mixed circuit) or the bit rate (in the case of a digital circuit).
Format:
12. xxxx.x Hz; or kHz; or MHz; bit/s; or kbit/s;
or Mbit/s;
Rule for the notation of the figures:
Leading zeros may be omitted, and if the decimal is a zero,
this decimal and the decimal point may also be omitted.
If the figure is up to 999, use Hz, bit/s.
If the figure is between 1000 and 9 | 99 | 99, use kHz,
kbit/s.
If the figure is 10 | 00 | 00 or more, use MHz, Mbit/s.
Specification:
If the circuit is analogue or mixed analogue/digital: the
bandwidth in Hz, kHz, MHz
If the circuit is digital: the bit rate in bit/s, kbit/s,
Mbit/s.
2.13 Signalling type (item 13)
This item presents the signalling information that applies to
the circuit.
Format:
13. xx . | | | xx; (maximum 20 characters).
Specification:
If the signalling is of the type xxxx Hz/xx Hz: xxxx/xx
If the CCITT Signalling System R2 is applied: R2
If the CCITT Signalling System R2-digital is applied: R2D
If the CCITT Signalling System No. 4 is applied: C4
If the CCITT Signalling System No. 5 is applied: C5
If the CCITT Signalling System No. 6 is applied: C6, xxx/yy
where xxx/yy refers to band and circuit number respectively
If the CCITT Signalling System No. 7 is applied: C7, xxxx,
Y-YYY-Y, Z-ZZZ-Z
where xxxx refers to the circuit identification code (CIC)
Y-YYY-Y refers to the international signalling point code
(ISPC) for town A/international exchange
Z-ZZZ-Z refers to the ISPC for town B/international
exchange.
Example:
For a circuit with C6-signalling type and being the 7th
circuit in band number 32:
13. C6, 032/06; (circuit counting starts at 0).
3 Designations of international fixed (non-switched) circuits
3.1 General
The designations of leased circuits and public fixed circuits
are treated in SS 3.2 and 3.3 respectively. The format of the
designation of fixed circuits are shown in Table 3/M.140.
H.T. [T3.140]
TABLE 3/M.140
_______________________________________________________________________________________________________________________________________________________________________
Format of designation Town A / {
Transmission station | ua) suffix
(optional)
} - Town B / {
Transmission station | ua) suffix
(optional)
} Function code Serial number
_______________________________________________________________________________________________________________________________________________________________________
Signs Characters Slash Letters/ digits Hyphen Characters Slash Letters/ digits Space Letters/ digits Digits
_______________________________________________________________________________________________________________________________________________________________________
Number of characters 12 1 3 1 12 1 3 1 1 to 14 4
_______________________________________________________________________________________________________________________________________________________________________
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Table 3/M.140 [T3.140], p.
The elements of the format are as follows:
a) Traffic relation
Towns A and B, possibly with a transmission station suf-
fix, identify the terminal points of the circuit. The identifica-
tion of the terminal point is up to the Administration concerned.
In the case where a town name exceeds the maximum length of
12 characters, the Administration should supply a suitable abbrevi-
ation which must be unique (see S 0.1).
The transmission station suffix (maximum 3 characters) is
an optional field which may be used to further identify the termi-
nal point, e.g., when there is more than one carrier operating in
the town. The necessity for a suffix and its form should be decided
by the Administration operating the circuit in the town concerned.
b) Function code (maximum 4 characters)
This code identifies the type of the circuit; see SS 3.2
and 3.3.
c) Serial number (maximum 4 digits)
There should be a separate serial numbering series for
each traffic relation and function code. In case of more than one
carrier in the town, the serial numbering will be on a transmission
station to transmission station basis.
The designations of the different categories of leased cir-
cuits are given below. In special cases in which CCITT Recommenda-
tions do not apply, agreement should be reached between the termi-
nal Administrations.
3.2 International leased circuits
3.2.1 General
Leased circuits are fixed circuits for private services or
particular purposes. They are distinguished by the letter P.
The designation format for leased circuits is as stated in S
3.1. Possible function codes are:
P for analogue leased circuits used wholly for
telephony
TP for analogue leased circuits used for
voice-frequency telegraphy
TDP for analogue leased circuits used for
TDM-telegraphy
DP for analogue leased circuits used wholly for
data transmission
FP for analogue leased circuits used wholly for
phototelegraphy or facsimile
RP for analogue leased unidirectional
sound-programme circuits
RRP for analogue leased reversible sound-programme
circuits
VP for analogue leased unidirectional
television-programme circuits
VVP for analogue leased reversible
television-programme circuits
XP for analogue leased circuits used for multiple
type transmissions
NP for digital leased circuits.
Note - In case of leased circuits connecting three or more
locations the letter M should follow these function codes.
3.2.2 Analogue leased circuits used for telephony
The terminal points of the circuits are arranged in alphabeti-
cal order.
The function code is: P.
Example:
The lst analogue leased circuit used for telephony between
Paris and Wellington (New Zealand) is designated:
Paris-WellingtoNZL P1.
3.2.3 Analogue leased circuits used for telegraphy
3.2.3.1 Voice-frequency telegraphy
The terminal points of the circuits are arranged in alphabeti-
cal order.
The function code is: TP.
Example:
The lst analogue leased circuit used for voice-frequency
telegraphy between Bern 1RS and New York 1RC is designated:
Bern/1RS-New York/1RC TP1.
3.2.3.2 TDM-telegraphy
The terminal points of the circuits are arranged in alphabeti-
cal order.
The function code is: TDP.
Example:
The 3rd analogue leased circuit used for TDM-telegraphy
between London and Montreal is designated:
London-Montreal TDP3.
3.2.4 Leased telegraph circuits
See Recommendation R.70 [3].
3.2.5 Analogue leased circuits used for data transmission
The terminal points of the circuits are arranged in alphabeti-
cal order.
The function code is: DP.
Example:
The 3rd analogue leased circuits used for data transmission
between London and Paris is designated:
London-Paris DP3.
3.2.6 Analogue leased circuits used for phototelegraphy or
facsimile
The terminal point of the circuits are arranged in alphabeti-
cal order.
If these circuits are different from P-circuits the function
code is: FP.
Example:
The 2nd analogue leased circuits used for phototelegraphy
between London and Paris is designated:
London-Paris FP2.
If normal P-circuits are used, then these circuits are desig-
nated accordingly.
3.2.7 Analogue leased circuits used for sound-programme
transmission
3.2.7.1 Analogue leased unidirectional sound-programme cir-
cuit
The terminal points of the circuits are arranged in the order
corresponding to the direction of transmission (instead of alpha-
betically, if this is different).
The function code for these circuits is: RP.
Serial numbering: Circuits which transmit in the direction
corresponding to the alphabetical order of the terminals should
have odd serial numbers, circuits in the other direction even
numbers.
Examples:
The first leased sound-programme circuit transmitting in
the direction Montreal to Wellington (New Zealand) will be desig-
nated:
Montreal-WellingtoNZL RP1.
The first leased sound-programme circuit transmitting in
the direction Wellington (New Zealand) to Montreal will be desig-
nated:
WellingtoNZL-Montreal RP2.
3.2.7.2 Analogue leased reversible sound-programme circuits
The terminal points of the circuits are arranged in alphabeti-
cal order.
The function code is: RRP.
Example:
The first leased circuit with reversible sound-programme
transmission between Montreal and Wellington (New Zealand) is
designated:
Montreal-WellingtoNZL RRP1.
3.2.8 Analogue leased circuits used for television
transmission
3.2.8.1 Analogue leased unidirectional television-programme
circuits
The terminal points of the circuit are arranged in the order
corresponding to the direction of transmission (instead of alpha-
betically if this is different).
The function code is: VP.
Serial numbering, circuits which transmit in the direction
corresponding to the alphabetical order of the terminals should
have odd serial numbers, circuits in the other direction even
numbers.
Example:
The first leased television programme circuit transmitting
in the direction Wellington (New Zealand) to Montreal will be
designated:
WellingtoNZL-Montreal VP2.
3.2.8.2 Analogue leased reversible television-programme
circuits
The terminal points of the circuits are arranged in alphabeti-
cal order.
The function code is: VVP.
Example:
The first circuit with reversible television transmission
between Montreal and Wellington (New Zealand) is designated:
Montreal-WellingtoNZL VVP1.
3.2.9 Leased circuits used for digital video transmission
These circuits are designated as digital leased circuits
(irrespective of the use), see SS 3.2.15 and 3.2.16.
3.2.10 Analogue leased circuits connecting circuit multi-
plication terminal equipments as renters' premises
These circuits are designated as normal leased circuits. The
information indicating that these circuits connect circuit multi-
plication terminal equipment can be recorded under item 9 (use) of
related information (see S 4.9).
Circuits routed via circuit multiplication equipment are also
designated as normal circuits. The multiplication equipment appears
under item 8 (equipment information) of related information (see
S 4.8).
3.2.11 Analogue leased circuits used for transmission other
than those designated in the paragraphs above, or used for combina-
tions of transmissions
In this category are circuits used for different transmissions
at different times, or circuits in which the bandwidth is divided
into two or more bands, thus providing two or more derived circuits
which may be used for different transmissions.
The terminal points of the circuits are arranged in alphabeti-
cal order.
The function code is: XP.
Example:
Bruxelles-Paris XP8.
3.2.12 Analogue leased circuits connecting three or more
locations
Various types and configurations of multiterminal circuits
fall into this category. Each section of the circuit should have a
unique designation. A section is any part of the circuit which con-
nects a branching point to either a customer terminal or another
branching point.
International sections should use the designation described
below.
The terminal town points of each section are arranged in
alphabetical order.
The function code is formed by adding the letter M to the
function codes recommended in SS 3.2.2 to 3.2.11. This leads, in
principle, to the function codes PM, TPM, TDPM, DPM, FPM, RPM,
RRPM, VPM, VVPM and XPM.
The association between sections should be recorded in the
related information of each section under item 7 (association) (see
S 4.7).
Wholly national sections with national designations may be
included if bilaterally agreed.
Example:
Let there be an international multiterminal leased circuit
connecting Bruxelles and Paris (7th PM circuit between Bruxelles
and Paris) with branches from Bruxelles to Edinburgh (1st PM cir-
cuit on this relation) and from Bruxelles to Aachen
(4th PM-circuit) and with an extension from Paris to Marseille.
The international sections are designated:
Bruxelles-Edinburgh PM1
Aachen-Bruxelles PM4
Bruxelles-Paris PM7.
3.2.13 Leased analogue groups, supergroups, etc.
These groups, supergroups, etc. will receive a circuit type
designation. The additional information on the constitution of
these leased groups, supergroups, etc. is to be recorded in related
information under item 12 (bandwidth or bit rate, see S 4.12) and
under item 6 (routing, see S 4.6).
The function codes are according to the relevant codes for
circuits.
Example:
A supergroup between renters' premises in London and Paris
for data transmission which is the 15th lease circuit for data
transmission on this relation, is designated:
London-Paris DP15.
3.2.14 Leased analogue group, supergroup links
These group and supergroup links will receive a circuit type
designation. The additional information on the constitution of
these leased group, supergroup links, etc. is to be recorded in
related information under item 12 (bandwidth or bit rate, see
S 4.12) and under item 6 (routing, see S 4.6).
Example:
A group link provided between renters' premises in London
and Montreal devoted to data transmission which is the 10th leased
circuit for data transmission on this relation, is designated:
London-Montreal DP10.
3.2.15 Digital leased circuits connecting two locations
Destinations given below also apply for leased digital blocks
and paths.
Note 1 - For digital leased circuits, the use of the circuit
will no longer be taken into account for the designation: the use
may change without notification to the Administration or may be
unknown.
The additional information concerning the bit rate is to be
found in related information under item 12 (bandwidth or bit rate,
see S 4.12).
The terminations of the circuit are placed in alphabetical
order.
The function code is: NP.
Example:
The 5th digital leased circuit between Birmingham and
Toulouse is designated:
Birmingham-Toulouse NP5.
Note 2 - It may happen that a digital leased circuit has
been routed via one or more international exchanges; in this case,
they are designated as normal digital leased circuits. However, in
such cases, an international exchange suffix may replace the
transmission station suffix. The information concerning the per-
manent switched mode is recorded in related information under
item 8 (equipment information, see S 4.8).
Example:
The 12th digital leased circuit between users' premises in
Athens and Reims which is connected to transmission station TS2 in
Athens and permanently switched in the international exchange IP2
in Reims is designated:
Athinai/TS2-Reims/IP2 NP12.
(Recording of suffixes is not mandatory.)
3.2.16 Digital leased circuits connecting three or more
locations
Various types and configurations of multiterminals circuits
fall into this category. Each section of the circuit should have a
unique designation. A section is any part of the circuit which con-
nects a branching point to either a customer terminal or another
branching point. (See also Recommendation M.1055 [4]).
International sections should use the designation described
below.
The terminal points of each section are arranged in alphabeti-
cal order.
The function code is formed by adding the letter M to the
function code recommended in S 3.2.15, i.e., the function code
is: NPM.
The association between sections should be recorded in the
related information of each section under item 7 (association, see
S 4.7).
Wholly national sections with national designations may be
included if bilaterally agreed.
Example:
In an international digital multiterminal leased circuit
connecting Oslo, London, Paris, Rome and Amsterdam, the interna-
tional section between Oslo and London (being the lst NPM circuit
on this relation) is designated:
London-Oslo NPM1.
3.3 Fixed (non-switched) public circuits
3.3.1 General
The designation format is according to S 3.1. Possible func-
tion codes are:
R for a unidirectional sound-programme circuit
RR for a reversible sound-programme circuit
RK for telephone type circuits for narrow band
sound-programme transmission
V for a unidirectional television circuit
VV for a reversible television circuit
F for a phototelegraphy or facsimile circuit
T for circuits providing voice-frequency telegraph
links
TD for circuits providing TDM-telegraph systems
D for data transmission circuits
DL for circuits providing transfer link for common
channel signalling systems.
Note - Information on whether a sound-programme circuit
together with a second sound-programme circuit form a stereophonic
pair will be recorded in the related information under the
item No. 7 (association, see S 4.7).
3.3.2 Circuits used for sound-programme transmission
3.3.2.1 Circuits used for unidirectional sound-programme
transmission
The terminations of the circuit are arranged in the order
corresponding to the direction of transmission (instead of alpha-
betically, if this is different).
The function code is: R.
Serial numbering: Circuits which transmit in the direction
corresponding to the alphabetical order of the terminals should
have odd serial numbers. Circuits which transmit in the direction
corresponding to the inverse alphabetical order of the terminals
should have even serial numbers.
Example:
The 1st circuit transmitting in the direction Wellington
(New Zealand) to Montreal is designated:
WellingtoNZL-Montreal R2.
3.3.2.2 Circuits used for reversible sound-programme
transmission
The terminations of the circuit are arranged in alphabetical
order.
The function code is: RR.
Example:
The 1st circuit with reversible sound-programme transmis-
sion between Montreal and Wellington (New Zealand) is designated:
Montreal-WellingtoNZL RR1.
3.3.2.3 Telephone-type circuits used for narrow-band
sound-programme transmission
In the traffic relation, the terminals of the circuit are
arranged in the order corresponding to the direction of operation
(instead of alphabetically, if this is different).
The function code is: RK.
Serial numbering: Circuits which transmit in the direction
corresponding to the alphabetical order of the terminals should
have odd serial numbers. Circuits which transmit in the direction
corresponding to the inverse alphabetical order of the terminals
should have even serial numbers.
Example:
The 1st telephone-type circuit set up for the narrow-band
sound-programme transmission in the direction from Milano to Madrid
is designated.
Milano-Madrid RK2.
3.3.3 Circuits used for television transmission
3.3.3.1 Circuits used for unidirectional television
transmission
In the traffic relation, the terminations of the circuit are
arranged in the order corresponding to the direction of transmis-
sion (instead of alphabetically, if this is different).
The function code is: V.
Serial numbering: Circuits which transmit in the direction
corresponding to the alphabetical order of the terminals should
have odd serial numbers. Circuits which transmit in the direction
corresponding to the inverse alphabetical order of the terminals
should have even serial numbers.
Example:
The 1st unidirectional television circuit transmitting in
the direction Paris to Helsinki is designated:
Paris-Helsinki V2.
3.3.3.2 Circuits used for reversible television transmis-
sion
The terminations of the circuit are arranged in alphabetical
order.
The function code is: VV.
Example:
The 1st reversible television transmission circuit between
Tokyo TS1 and New Delhi is designated:
New Delhi-Tokyo/TS1 VV1.
3.3.4 Circuits for digital audio and video transmission
These circuits are designated according to the data transmis-
sion system, see S 11.
3.3.5 Telephone-type circuits used for phototelegraphy or
facsimile
Circuits used for phototelegraphy or facsimile which are dif-
ferent from normal telephone circuits will have the function code:
F.
The terminal points of the circuit are arranged in alphabeti-
cal order.
If normal telephone circuits are used, they are designated
accordingly. Information about the usage may be recorded in the
related information under item 9 (use, see S 4.9).
Example:
The first circuit for phototelegraphy between Koebenhavn
and Tokyo:
Koebenhavn-Tokyo F1.
3.3.6 Telephone-type circuits used to provide
voice-frequency telegraph links
The terminal points of the circuit are arranged in alphabeti-
cal order.
The function code is: T.
Example:
The 1st circuit to provide a voice-frequency telegraph link
between Koebenhavn 1 and Montreal 1TE is designated:
Koebenhavn/1-Montreal/1TE T1.
(Suffixes are optional)
A reserve T-circuit is designated according to its present
function. Information concerning the nature of the reserve
T-circuit is found in the related information under item 7 (associ-
ation, see S 4.7).
3.3.7 Telephone-type circuits used to provide TDM (time
division multiplex) telegraph systems
The terminal points of the circuit are arranged in alphabeti-
cal order.
The function code is: TD.
Example:
The first circuit to provide a TDM-telegraph system between
London Keybridge and Montreal 1TE:
London/KB-Montreal/1TE TD1.
(Suffixes are optional)
A reserve TD-circuit is designated according to its present
function. Information concerning the nature of the reserve
TD-circuit is found in the related information under item 7 (asso-
ciation, see S 4.7).
3.3.8 Telephone-type circuits used for data transmission
The terminal points of the circuit are arranged in alphabeti-
cal order.
The function code is: D.
Example:
The 1st circuit used for data transmission between Frank-
furt 1 and Toronto 1TE is designaged:
Frankfurt/1-Toronto/1TE D1.
(Suffixes are optional)
3.3.9 Telephone-type circuits used as transfer links for
common channel Signalling Systems No. 6 and No. 7
The terminal points of the circuit are arranged in alphabeti-
cal order.
The function code is: DL.
Example:
The first data link used for common channel signalling
between Sacramento 4ESS and Tokyo Shinjuku is designated:
Sacramento/4ES-Tokyo/SJK DL1
(Suffixes are optional.)
3.4 Related information
The additional information on fixed circuits is covered by the
following items:
1. urgency for restoration;
2. terminal countries;
3. administrations'carriers, or broadcasting
companies's names;
4. control and sub-control station(s);
5. fault report points;
6. routing;
7. association;
8. equipment information;
9. use;
10. transmission medium information;
11. composition of transmission;
12. bandwidth or bit rate;
13. signalling type;
14. applicable CCITT Recommendations;
The various items will be dealt with in S 4.
4 Related information for international fixed circuits
The following sections explain the items of related informa-
tion concerned with international fixed circuits. A full example
for the designation information of an international leased analogue
circuit is given in Annex A, S A.2.
4.1 Urgency for restoration (item 1)
This item supplies information on the urgency of restoration
of the circuit based upon bilateral agreement between the terminal
Administrations.
Format:
1. xxx | | | xx; (maximum 10 characters)
Illustration:
a) if the priority is top: 1;
if the priority is second: 2;
if the priority is third: 3; or
b) if repair is required within e.g., 24 hours: |
4 h; or
c) if no urgency has to be indicated: -;
Note - In the case of a digital leased circuit, the
priority or urgency may be decided upon by taking into account the
bit rate of the circuit.
4.2 Terminal countries (item 2)
This item presents the countries in which the circuit is ter-
minating.
Format:
2. XXX, YYY; (3 characters for each)
Specification:
XXX: code for country of town A
YYY: code for country of town B
Note - The codes are according to the ISO Standard 3166
[2].
Example:
For the circuit Paris-WellingtoNZL P1:
2. FRA, NZL;
4.3 Names of Administrations, carriers or broadcasting com-
panies (item 3)
This item records the names of the Administrations or carriers
which operate the circuit or, in the case of sound-programme and
television circuits, the name of the broadcasting company.
Format:
3. YYYYYY, ZZZZZZ; (maximum 6 characters for each)
Specification:
YYYYYY: code for company operating in town A
XXXXXX: code for company operating in town B
Example:
For the circuit Bern/1RS-NewYork/1RC TP1 operated by Radio
Suisse and RCA:
3. RS, RCA;
4.4 Control station [sub-control station(s)] (item 4)
This item lists the appointed control station and sub-control
stations (according to Recommendations M.80 and M.90 or M.1012 [5]
and M.1013 [6] for leased circuits). Further details about the sta-
tions can be found in the list of contact points
(Recommendation M.93).
Example:
4. CS: designation of control station,
SCS1: designation of sub-control station,
SCS2: designation of sub-control station,
. . . .
. . . .
. . . .
SCSn: designation of sub-control station.
Specification:
CS: designation of the control station,
SCS1: designation of the terminal sub-control sta-
tion,
SCS2 to SCSn: if applicable: other sub-control
station; have to be placed in the geographical order according to
the traffic relation.
Example:
For the circuit London/KB-Paris/ARC RP1 where Paris
Archives is the control station and London Keybridge is the
sub-control station:
4. CS: Paris/ARC,
SCS1: London/KB.
4.5 Fault report points (item 5)
This item presents the names of both fault report points on
the circuit. Further information about the fault report points can
be found in the list of contact points (Recommendation M.93).
Format:
5. Designation of fault report point, designation
of fault report point.
Specification:
The first fault report point is that of the country of town
A.
The second fault report point is that of the country of
town B.
Example:
The fault report points for the circuit Athinai-Roma DP3:
5. Athinai, Roma/TS1.
4.6 Routing (item 6)
This item shows the international primary group(s) or primary
block(s) and the channel number(s) which carry the circuit (see
Notes 1 and 2). If there are more than one, the groups or blocks
appear in the geographical order from town A to town B.
Format:
6. Designation of an international primary group
(Note 1) or primary block/channel number, designation of a primary
group of block/channel number, | | | , designation of a primary
group or block/channel number;
Example 1:
For the circuit from London Mollison to Paris Archives DP7:
6. London-Paris 1204/4;
Example 2:
For the wide-band circuit Frankfurt-London DP5:
6. Amsterdam-Frankfurt 6005/2, Amsterdam-London 6002/3;
Note 1 - In the case where a leased circuit consists of a
group or block, the primary groups or blocks are to be replaced by
the next higher groups or blocks. In this case the channel numbers
are to be replaced by the group numbers.
Note 2 - Primary groups or blocks can be unidirectional
as well. Two consecutive unidirectional groups or blocks are
separated by a + sign instead of a comma.
4.7 Association (item 7)
This item informs whether there are associated circuits and if
so, of what nature.
Format:
7. Association code: Designation(s) of associated
circuit(s);
Specification:
If the circuit has a reserve circuit, the association code
is: S followed by the function code and the serial number of the
principal circuit.
If the circuit is a reserve circuit, the association code
is: function code followed by S and the serial number of the
reserve circuit.
If the circuit is one of a stereophonic pair, the other
circuit will appear in this item. Association code is: H followed
by a 2 digit serial number indicating the number of the stereo-
phonic pair. This is followed by the function code and the serial
number of actual circuit.
If the circuit belongs to a multiterminal leased circuit,
the association code is: PM, DPM, etc. (see SS 3.2.12 and 3.2.16)
followed by the serial number of the circuit.
Example 1:
7. ST1: Roma/AS1-Zuerich/SEL Z13;
which indicates that the reserve circuit for the principal
circuit T1 is Roma/AS1-Zuerich/SEL Z13.
Example 2:
If the circuit London/KB-Paris/ARC R1 is bearing one chan-
nel of the second stereophonic pair from London to Paris, and
London/KB-Paris/ARC R5 bearing the other channel of this pair:
7. H02R1: London/KB-Paris/ARC R5;
which indicates that circuit R1, being one of the stereo-
phonic pair number 2, has as the other circuit of this pair:
London/KB-Paris/ARC R5.
Example 3:
If the circuit Bruxelles-Edinburgh PM1 is a part of an
international multiterminal telephone circuit connecting Bruxelles
and Paris (being the 7th PM-circuit on that relation) with branches
from Bruxelles to Edinburgh and to Aachen (being the 2nd PM-circuit
on that relation) and with an extension from Paris to Marseille,
then for the circuit Bruxelles-Edinburgh PM1:
7. PM1: Aachen-Bruxelles PM2, Bruxelles-Paris PM7;
Note - The international branches may appear in any order.
National branches may be added after bilateral agreement.
4.8 Equipment information (item 8)
This item records any equipment in the circuit which requires
special maintenance attention.
Format:
8. XX, XX, XX, XX, XX;
Specification:
If the circuit has been routed via digital circuit multi-
plication equipment: AM
If the circuit has been routed via digital circuit multi-
plication equipment
- using reduced bit rate encoding: RB
- using speech interpolation: SI
If the circuit has a compandor: CO
If the circuit consists of a semi-permanent switched con-
nection: SP
Note - If there is a need to record an additional special
equipment, the free code places are available for that purpose. The
codes to be used must consist of two characters, be unique and can
be chosen by bilateral agreement between Administrations.
4.9 Use (item 9)
This item identifies for what purpose the circuit is used (if
this is known by the Administration and of use for maintenance).
Format:
9. XXX | | | X; (maximum 7 characters)
Specification:
XX | | | X allows the record of the usage of the circuit.
If the circuit has been provided with circuit multiplica-
tion equipment at renters' premises with connection channels: CC.
4.10 Transmission medium information (item 10)
This item identifies whether a particular transmission medium
is required in the routing of the circuit.
Format:
10. ST: XX | | | | X; or 10. NS: XX | | | |
X; or 10. -; (XX | | | | X maximum 10 characters)
Specification:
If the circuit has to be routed via satellite: ST followed
by the designation of the satellite.
If the circuit must not be routed via satellite: NS fol-
lowed by the designation of the terrestrial transmission medium.
If there is no transmission medium requirement: -.
Example:
For the circuit London-Paris DP3 that has to be routed via
satellite Telecom 1:
10. ST: Tel 1.
4.11 Composition of the transmission (item 11)
This item shows type of transmission on the circuit.
Format:
11. A; N; or C;
Specification:
If the transmission is analogue: A
If the transmission is digital: N
If the transmission is mixed analogue/digital: C
4.12 Bandwidth or bit rate (item 12)
This item shows the bandwidth (in the case of an analogue cir-
cuit or mixed circuit) or the bit rate (in the case of a digital
circuit).
Format:
12. xxxx.x Hz; or kHz; or MHz; bit/s; or kbit/s;
or Mbit/s;
Rules for the notation of the figures:
Leading zeros may be omitted, and if the decimal is a
zero, this decimal and the decimal point may also be omitted.
If the figure is up to 999, use Hz, bit/s.
If the figure is between 1000 and 9 | 99 | 99, use kHz,
kbit/s.
If the figure is 10 | 00 | 00 or more, use MHz, Mbit/s.
Specification:
If the circuit is analogue or mixed analogue/digital: the
bandwidth Hz, kHz, MHz.
If the circuit is digital: the bit rate in bit/s, kbit/s,
Mbit/s.
Example:
For the circuit Bordeaux-Darmstadt NP7 with a bit rate of
64 kbit/s:
12. 64 kbit/s.
4.13 Signalling type (item 13)
This item presents the signalling type that applies to the
circuit (reference is made to Recommendations M.1045 [7]
and Q.8 [8]).
Format:
13. xxxxxxx; (maximum 7 characters)
Specification:
If the signalling is of the type xxxx Hz/xx Hz: xxxx/xx.
Otherwise the characters can be used on the basis of bilateral
agreement between the two terminal Administrations.
Example:
For a circuit with in-band signalling 1000 Hz/20 Hz:
13. 1000/20.
4.14 Application CCITT Recommendations (item 14)
This item records the CCITT Recommendation(s) applied as
regards the parameters of the circuit.
Format:
14. Rec. X.xxxx, Rec. Y.yyyy; or 14. Rec. X.xxxx;
or 14. -;
Specification:
The number of Recommendations to be recorded (2, 1 or 0) is
dependent on the need.
Example:
14. Recommendation M.1020;
5 Designations of international groups, supergroups etc.
(bidirectional and unidirectional)
5.1 General
The format of the designation of groups etc. is shown in
Table 4/M.140.
H.T. [T4.140]
TABLE 4/M.140
____________________________________________________________________________________________________________________________________________________________________________
Format of designation Town A / {
Transmission station suffix (optional)
} - Town B / {
Transmission station suffix (optional)
} Function code Serial number
____________________________________________________________________________________________________________________________________________________________________________
Signs Characters Slash Letters/ digits Hyphen Characters Slash Letters/ digits Space Letters/ digits Digits
____________________________________________________________________________________________________________________________________________________________________________
Number of characters 12 1 3 1 12 1 3 1 1 to 6 2 to 3
____________________________________________________________________________________________________________________________________________________________________________
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Table 4/M.140 [T4.140], p.
The elements of the format are as follows:
a) Traffic relation
Groups etc. are indicated by the names of the towns where
the groups, etc. terminate. For the spelling, see S 1.1. The town
names are arranged in alphabetical order. For multiple destination
unidirectional groups the name of town B is replaced by (MU) (see
S 5.3.1). In the case that a town name exceeds the maximum length
of 12 characters, the responsible Administration should supply a
suitable abbreviation that must be unique (see S 0.1).
The transmission station suffix (maximum 3 characters) is
an optional field which may be used to further identify the termi-
nal point when there is more than one carrier operating in the
town. The necessity for a suffix and its form should be decided by
the Administration operating the circuit in the town concerned.
b) Function code
This code consists of the nominal number of channels in
the group (see Note). In the case of a unidirectional single desti-
nation group, the number is preceded by (U) (see S 5.3.2).
Note - Where group, supergroup, etc., links are directly
interfaced by analogue to digital conversion equipment, the number
of channels is followed by the letter "C" (see S 10).
c) Serial numbering
The numbering is on a town-to-town basis with an exception
for the case where the suffix is used. The numbering for that case
is made on a transmission station to transmission station basis.
The numbering of a group, supergroup, etc., is applied
between the point where the group, etc. is assembled to the point
where it is broken down, independently of the position it occupies
in the band of line frequencies.
If the number is less than 10, it is preceded by a zero.
5.2 Bidirectional groups, etc.
For the definition, see Recommendation M.300.
5.2.1 Group
The function code is a number that indicates the nominal
number of channels in the group, as follows:
8 for 8 channel groups,
12 for 12 channel groups,
16 for 16 channel groups.
Example:
The third 12-channel group between Moskva and New York is
designated:
Moskva-New York 1203.
5.2.2 Supergroup
The function code is a number that indicates the nominal
number of channels in the supergroup, as follows:
60 for 60 channel supergroups.
80 for 80 channel supergroups.
Example:
The first 60 channel supergroup between London and Amster-
dam is designated:
Amsterdam-London 6001.
5.2.3 Mastergroup
The function code is: 300.
Example:
The first mastergroup between Bruxelles and London is
designated:
Bruxelles-London 30001.
5.2.4 Supermastergroup
The function code is: 900.
Example:
The tenth supergroup between Amsterdam and Paris is desig-
nated:
Amsterdam-Paris 90010.
5.2.5 Use of the groups, etc.
This information will be contained in related information
under item 9 (use, see S 7.9). If groups are used for private pur-
poses, see S 3.2.13.
5.2.6 Restoration groups and supergroups
Groups and supergroups set up on restoration groups and super-
groups, or on spare groups and supergroups for restoration pur-
poses, will receive a serial number from the 800 series, in des-
cending order and starting from 899.
Restoration groups: 8899, 8898, 8897, etc.,
12899, 12898, 12897, etc., or
16899, 16898, 16897, etc.,
as appropriate.
Restoration supergroups: 60899, 60898, 60897, etc.
Example 1:
The second 12-channel restoration group between London and
Sydney is designated:
London-Sydney 12898.
Example 2:
The first restoration supergroup between Amsterdam and
Bruxelles is designated:
Amsterdam-Bruxelles 60899.
5.3 Unidirectional groups and supergroups
5.3.1 Multiple destination unidirectional groups and super-
groups
The unidirectional route will be designated by the name of the
sending terminal station (in the general format: town A) followed
by a hyphen, whilst the letters MU (multiple destination unidirec-
tional) in parentheses replace town B. This will be followed by the
function code and serial number of the group or supergroup.
Example 1:
The first multiple destination unidirectional supergroup
from London (to, for example Bogota, Lusaka and Montreal) is desig-
nated:
London-(MU) 6001.
The next such supergroup from the same point of origin to
any destination would take the next number in the series, e.g., the
second supergroup from London is designated:
London-(MU) 6002.
This supergroup might go, for example, to Tokyo, Hawaii and
Melbourne.
Example 2:
The first supergroup from Montreal (to, for example, Lon-
don, Lusaka and Paris) is designed:
Montreal-(MU) 6001.
Note - Groups and supergroups routed via a multiple-access
system may be provided for exclusive use between two terminal sta-
tions only, in which case the normal designations given above in
this Recommendation will apply.
5.3.2 Single destination unidirectional groups and super-
groups
The unidirectional route will be designated by the name of the
sending terminal station (in the general format: town A) followed
by a hyphen and the name of the receiving terminal station
(town B). The function code consists of the letter U (unidirec-
tional) in parentheses and the nominal number of channels of the
group or supergroup.
Example:
A unidirectional group transmitting in the direction from
Paris to Etam, which, in the reverse direction of transmission is
assigned to a multiple destination unidirectional (MU) group from
Etam to Paris and Rio de Janeiro, would be designated as:
Paris-Etam (U) 1201.
The next group between these locations, Paris and Etam, if
bidirectional, would be designated in the normal manner as:
Etam-Paris 1202.
Note - Groups and supergroups routed via a multiple-access
system may be provided on a bidirectional basis for exclusive use
between two terminal stations only, and in this case the normal
designations given above in this Recommendation will apply.
5.4 Related information
The additional information on groups etc., is covered by the
following items:
1. urgency for restoration;
2. terminal countries;
3. administrations', carriers' or broadcasting
companies' names;
4. control and sub-control station(s);
5. fault report points;
6. routing;
7. association;
8. equipment information;
9. use;
10. transmission medium information;
11. (empty item, use: "-;");
12. bandwidth;
13. occupancy.
The various items will be dealt with in S 7.
6 Designations of international group links, supergroup links and
line links
6.1 Group and supergroup links
Group links and supergroup links are designated according to
the general format for groups (see S 5.1). In practice, it may be
that terminal equipment is not connected to a group link or super-
group link. Nevertheless, for designation purposes, the link will
be numbered as though terminal equipment were connected.
6.1.1 Conventional links not connected to their terminal
equipment
Such links are included in the normal numbering sequence of
groups and supergroups and are not given a separate numbering
sequence.
When a group link or supergroup link is used only part time
with terminal translating equipment (to provide a conventional
group or supergroup) it will be designated in the normal way. The
part time condition of the group link has to be indicated in
related information under item 9 (use, see S 7.9).
Example:
The group link between Amsterdam and London set up follow-
ing 5 groups already in service, is designated:
Amsterdam-London 1206.
6.1.2 Restoration links
Group links and supergroup links nominated for restoration
purposes will receive a serial number from the 800-series in
ascending order and starting from 801.
Restoration group links: 12801, 12802, 12803, etc.,
Restoration supergroup links: 60801, 60802, 60803,
etc.
Example:
The second restoration group link between Hong Kong and
Sydney is designated:
Hong Kong-Sydney 12802.
Note - The first two digits (e.g., 12) in the designation of
a restoration group link do not necessarily indicate the number of
channels in the group which is set up via the link. For example, a
restoration group link London-Montreal 12801 might be used to
restore the group London-Montreal 1605.
6.2 Line links
The format of the designation of line links is shown in
Table 5/M.140.
H.T. [T5.140]
TABLE 5/M.140
__________________________________________________________________________________________________________________________________________________________________________
Format of designation Town A / {
Transmission station suffix (optional)
} - Town B / {
Transmission station suffix (optional)
} Function code Serial number
__________________________________________________________________________________________________________________________________________________________________________
Signs Characters Slash Letters/ digits Hyphen Characters Slash Letters/ digits Space Letters/ digits Digits
__________________________________________________________________________________________________________________________________________________________________________
Number of characters 12 1 3 1 12 1 3 1 3 to 5 2
__________________________________________________________________________________________________________________________________________________________________________
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Table 5/M.140 [T5.140], p.
-v'1P' The elements of the format are as follows:
a) Traffic relation
The two terminals are arranged in alphabetical order. For
the use of the suffix, see S 5.1.
b) Function code
This code consists of a number indicating the nominal tele-
phone channel transmission capacity followed by the letter A.
c) Serial number
This is a two-digit number.
Example 1:
The first 1840 telephone channel capacity line link
between Beaver Harbour and Widemouth is designated:
Beaver Harbo-Widemouth 1840A01.
Example 2:
The first 432 telephone channels capacity line link
between Etam and Pleumeur-Bodou is designated:
Etam-Pleumeur-Bod 432A01.
Note - Line links are sometimes characterized by having chan-
nel capacities not in accordance with normal group,
supergroup, etc., alignments. Examples of these nonstandard capaci-
ties may often be found in submarine cable or satellite line links.
These links will be numbered in accordance with the nominal channel
capacity of the link.
6.3 Related information
The additional information on group links, supergroup links
and line links is covered by the following items:
1. urgency for restoration;
2. terminal countries;
3. administrations', carriers', or broadcasting
companies' names;
4. control and sub-control station(s);
5. fault report points;
6. routing;
7. association;
8. equipment information;
9. use;
10. transmission medium information;
11. (empty item, use: "-;");
12. bandwidth;
13. occupancy (this item is not in use for group,
etc.); links,
The various items will be dealt with in S 7.
7 Related information for international groups, goup links
and line links
The following sections explain the items of related informa-
tion concerned with international groups, group links, line
links, etc. Full examples for the designation information of an
international group and an international group link is given in
Annex A, S A.3.
7.1 Urgency for restoration (item 1)
This item supplies information on the urgency of restoration
of the group/group link based upon bilateral agreement between the
terminal Administrations.
Format:
1. xxx . | | | xx; (maximum 10 characters)
Illustration:
a) if the priority is top: 1;
if the priority is second: 2;
if the priority is third: 3; or
b) if repair is required within e.g., 24 hours: |
4 h; or
c) if no urgency has to be indicated: -;
Example:
If the group Bonn-Paris 1201 needs top priority restora-
tion:
1. 1;
7.2 Terminal countries (item 2)
This item presents the countries in which the group/group link
is terminating.
Format:
2. XXX, YYY; or XXX; (3 characters for each)
Specification:
XXX code for country of town A
YYY code for country of town B
In the case of a multiple destination unidirectional group
(MU), only XXX applies.
Example 1:
For the group Beograd-Roma 1201:
2. YUG, ITA;
Example 2:
For the multiple destination group Toronto-(MU) 1202
2. CAN;
Note - The codes are according to ISO Standard 3166 [2].
7.3 Names of Administrations, carriers or broadcasting com-
panies (item 3)
This item records the names of the carriers, etc., which
operate the group/group link.
Format:
3. XXXXXX, YYYYYY; or XXXXXX; (maximum 6 charac-
ters for each)
Specification:
XXXXXX: name of company in town A
YYYYYY: name of company in town B
In the case of an unidirectional multiple destination, only
XXXXX applies.
Example 1:
For the supergroup Amsterdam-London 6002:
3. NLDPTT, BTI;
Example 2:
For the multiple destination group Hong Kong-(MU) 1201:
3. HKGTEL;
7.4 Control station [sub-control station(s)] (item 4)
This item lists the appointed control station and sub-control
stations (according to Recommendations M.80 and M.90). Further
details about the stations can be found in the list of contact
point (Recommendation M.93).
Format:
4. CS: designation of control station,
SCS1: designation of sub-control station,
SCS2: designation of sub-control station,
. . . .
. . . .
. . . .
SCSn: designation of sub-control station,
or in the case of a multiple destination unidirectional
group:
4. CS: designation of control station;
Specification:
CS: designation of the control station;
SCS1: designation of the terminal sub-control sta-
tion;
SCS2 to SCSn: if applicable: other sub-control
stations, are to be placed in the geographical order according to
the traffic relation.
In the case of a multiple destination unidirectional group,
only CS applies.
Example 1:
For a group Helsinki-Paris 1201 where the control station
is Helsinki TM1 and the sub-control station is Paris Archives:
4. CS: Helsinki/TM1,
SCS1: Paris/ARC;
Example 2:
For the multiple destination unidirectional group Wien-(MU)
1201:
4. CS: Wien/ARS;
7.5 Fault report points (item 5)
This item presents the names of both fault report points on
the group/group link (according to Recommendation M.130). Further
details about the fault report points can be found in the list of
contact points (Recommendation M.93).
Format:
5. Designation of fault report point, designation
of fault report point;
or
5. Designation of fault report point;
Specification:
The first fault report point is that of the country of
town A. The second fault report point is that of the country of
town B. In the case of a multiple destination unidirectional group,
there is only one fault report point under item 5.
Example 1:
For the group Moskva-Paris 1201;
5. Moskva/MNA, Paris/ARC;
Example 2:
For the multiple destination unidirectional group Caracas-
(MU) 1201:
5. Caracas/TS1;
7.6 Routing (item 6)
This item records the next higher group within the multiplex
hierarchy on which the group/group link has been routed and the
position number, or in the case of the highest multiplex level, the
transmission media on which the group/group link has been routed.
Format:
6. Designation of an international group/position
number or designation of transmission medium, designation of an
international group/position number or designation of transmission
medium, | | | , designation of an international group/position
number or designation of transmission medium;
Note - Two consecutive unidirectional groups are separated
by a + sign instead of a comma.
Specification:
The designation of an international group refers to the
next higher level in the multiplex hierarchy. If there are more
than one, the groups are noted in geographical order from town A to
town B
The designation of the transmission medium refers to the
transmission medium leaving the country of town A and to the
transmission medium entering the country of town B respectively.
As no CCITT designations of transmission media are provided
for the time being, the terminal countries should provide designa-
tions or agree on designations.
If there is only one transmission medium, the designation
of this medium applies.
Example 1:
A group Alger-London 1201 has been routed internationally
as follows:
6. Alger-Paris 6002B/F2, London-Paris 6040/5;
Example 2:
A supermaster group Barcelona-Perpignan 90001 has been
routed as follows:
6. Gerona-Perpignan 1800A08;
Example 3:
A group Caracas-Paris 1201 has been routed as follows:
6. Caracas-Paris 6001/2+Caracas-(MU) 6002/3;
7.7 Association (item 7)
This item informs whether there are associated group/group
links and if so, of which nature.
Format:
7. Association code: designation(s) of the associ-
ated group(s) or group link(s);
Specification:
If the group has a reserve group the association code is:
S followed by the function code and the serial number of
the group.
If the group is a reserve group the association code is:
function code followed by S and the serial number of the
reserve group.
The same applies for group links.
Example:
If the normal group is Bruxelles-Luxembourg 1215 and if
the group Bruxelles-Luxembourg 12899 serves as a restoration group
for the group Bruxelles-Luxembourg 1215:
7. S1215: Bruxelles-Luxembourg 12899;
For the group Bruxelles-Luxembourg 12899 there has to be
recorded under item 7:
7. 12S899: Bruxelles-Luxembourg 1215;
7.8 Equipment information (item 8)
This item records information on equipment in the group/group
link which requires special maintenance attention.
Format:
8. XX, XX, XX, XX;
Specification:
If the group is carrying companded circuits: CO
If a group has been routed via TDMA: TD
If there is no special equipment: -
Note - If there is a need to record any additional equip-
ment information, the free codeplaces are available for that pur-
pose. The codes to be used must consist of two characters, be
unique and can be chosen by bilateral agreement between Administra-
tions.
Example:
If a group Geneva-Mexico 1210 is carrying companded cir-
cuits:
8. CO;
7.9 Use (item 9)
This item identifies for what purpose the group/group link is
used (if this is known by the Administration and of use for mainte-
nance).
Format:
9. XXXXXX; (maximum of 6 characters)
Specification:
XXXXXX refers to (among others) the designatory letters Z,
B, D, X, DP, RP, VP, etc., as explained in SS 1 and 3. If no other
information available, the sign - is used.
Example:
If the group London-Melbourne 1212 is dedicated to DP-
circuits:
9. DP;
7.10 Transmission medium information (item 10)
This item identifies whether a satellite is involved in the
routing.
Format:
10. ST; or -;
Specification:
If the group/group link has been routed via satellite: ST
If the group/group link has not been routed via satellite:
-
Example:
If the group Caracas-Madrid 1203 has been routed via satel-
lite:
10. ST;
7.11 End-to-end information (for mixed analogue/digital
routes only) (item 11)
This item provides information on the destinations of the
traffic carried by the group.
Format:
11. X | | | | , Y | | | | ; (maximum 12
characters each) or -;
Specification:
X | | | | and Y | | | | are the names of a town
and refer to the destinations of the traffic on the group. The des-
tinations are placed according to the order of towns in the traffic
relation.
If the group has a multiple destination, one town name is
replaced by the code: M.
If the group is within an analogue environment, X | | |
| , Y | | | | is replaced by the sign -.
Example:
If the group Athinai-Paris 60C11 carriers traffic from
Bruxelles to Sofia:
11. Sofia, Bruxelles;
7.12 Bandwidth (item 12)
This item shows the bandwidth of the group/group link.
Format:
12. xxxx kHz or MHz or GHz
Rules for the notation of the bandwidth figures:
No leading zeros required
If the figure is between 10 | 00 and 9 | 99 | 99, use kHz
If the figure is between 10 | 00 | 00 and 9 | 99 | 99 | 99,
use MHz
If the figure is 10 | 00 | 00 | 00 or more, use GHz.
Example:
A group Bangkok-New Delhi 1201:
12. 48 kHz;
7.13 Occupancy (for groups/supergroups, etc., and for line
links) (item 13)
This item lists the occupancy of the group expressed by the
next lower group and/or circuits which have been routed in the
group.
Format in the case of a group (lowest level):
13. Position number: designation of the circuit,
or the sign -,
. . . . . .
Position number: designation of the circuit, or the sign -;
Format in the case of a supergroup or higher level group:
13. Position number: designation of a group, of a
leased circuit, or the sign -,
. . . . . . . .
Position number: designation of a group of a leased cir-
cuit, or the sign -;
Specification:
If the position number is occupied by a next lower group:
designation of this group.
If the position number is occupied by a leased circuit
(with a bandwidth corresponding to the bandwidth of the next lower
multiplex level, e.g., see S 3.2.13): designation of this leased
circuit.
If the position number is not in use: -
Example:
For a supergroup Athinai-Paris 6002:
13. 01: Beyrouth-Paris 1209,
02: London-Sofia 1202,
03: Athinai-Paris 1205,
04: Athinai-Rotterdam 1202,
05: Athinai-Paris DP4;
MONTAGE: REC. M.140 S8. SUR LE RESTE DE CETTE PAGE